Preparation, properties and long term performance of spongy Raney nickel type electrocatalysts for cathodic H2 evolution show that secondary structure (fine pores) and tertiary structure (coarse pores and cracks) of this catalyst depend on the chosen preparation procedure and that they influence the effective catalytic activity sizeably. Long term performance is remarkably improved by controlled leaching of the Raney-nickel precursor and oxidative aging of the developed Raney-metal matrix. Porous oxygen evolving anodes containing metallic cobalt and nickel are prepared by reductive sintering and the effect of chemical composition on catalytic activity is reported. It is still impossible to combine highest activities with technically sufficient longevity of this type of activated anodes.
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Copyright © 1989 Published by Elsevier B.V.